Incandescent Light Bulbs last about 1,000 hours or less than a year. ( Average $ .50 cents)
Compact Fluorescent Lamp or CFL bulbs last up to 6,000 hours or four years. (Average $2.00)
CFL can save over $40 in electricity costs over the lamp's lifetime when compared to Incandescent .

Philips’ Endura LED A21 17-watt LED bulb has a rated life of 25,000 hours or 17 years and is 80 percent more energy-efficient than the traditional Incandescent Bulb (Consumes 80% less energy) This replacement for a 75 watt Incandescent Light Bulb has a light output of 1,100 lumens,
has a color temperature of 2700k and a Color rendering index (CRI) of 80. ($45.00)

Almost as good as the Centennial Bulb.

The same CFL consumes 18–25 watts of energy but lasts only 4 years.
So you have to ask how much time, people and resources it takes to build an LED and a CFL,
and then also find out what's the environmental impact when building it and recycling it?
When this is done you can then determine the actual cost of the product.